fix: fix basePath support for API routes

[socsieng]

Fixes: #522

I've verified changes locally but I couldn't find a way to easily include unit tests for this change. Please let me know if there are any additional changes you'd like me to make.

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Name	Status	Preview	Comments	Updated (UTC)
open-next	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 23, 2024 7:28pm

[conico974]

Thanks for the PR.
Just a few minor things to change though

[conico974]

LGTM. Thanks